SC16IS752/SC16IS762：I2C/SPI到RS-232/RS-485转换器芯片

需积分: 10 201 浏览量更新于2024-07-22 收藏 477KB PDF 举报

"SC16IS752与SC16IS762是两种微控制器接口芯片，设计用于在I2C总线或SPI总线与双通道高性能UART之间进行无缝协议转换，支持高达5Mbit/s的数据传输速率。它们具有低功耗和休眠模式，特别适用于便携式、电池供电的应用。这些芯片提供了额外的可编程I/O引脚，以适应不同的系统需求。SC16IS762相比于SC16IS752，其SPI时钟速度可以达到15Mbit/s，而SC16IS752则是4Mbit/s，并且SC16IS762支持IrDA SIR速率高达1.152Mbit/s。两款芯片的内部寄存器集与流行的16C450兼容，简化了软件开发和移植工作。此外，它们还具备自动硬件和软件流控制、自动RS-485支持等功能，增强了通信的可靠性和灵活性。" SC16IS752和SC16IS762是微控制器通信领域中的关键组件，主要用于将I2C或SPI总线协议转换为RS-232或RS-485串行通信标准。这两种芯片都采用小型封装，如HVQFN32和TSSOP28，减小了板级空间的需求，适合于手持设备和电池供电的系统。 SC16IS752和SC16IS762的主要区别在于SPI接口的速率和支持的红外数据协会（IrDA）速率。SC16IS762具有更高的SPI时钟速度，能够处理更快的数据传输，对于需要高速数据交换的应用场景尤为适用。同时，它也支持IrDA SIR（同步红外）通信，最大可达1.152Mbit/s，使得设备能够与使用IrDA标准的其他设备进行通信。这两款芯片的内部寄存器集与16C450兼容，16C450是广泛应用且广受好评的UART，这使得开发人员能够轻松地编写或从其他平台移植软件。这种兼容性降低了开发成本，提高了代码的重用性。 SC16IS752和SC16IS762的高级特性包括硬件和软件的自动流控功能，这一特性可以防止数据溢出，确保数据传输的有序进行。同时，它们内置了自动RS-485支持，对于RS-485网络环境，芯片能自动切换发送和接收模式，简化了硬件设计。这些特性使得这两个芯片在需要高效率、高可靠性通信的系统中具有显著优势。 SC16IS752和SC16IS762是针对嵌入式系统和物联网应用的高效、灵活的通信接口解决方案，它们提供了多种功能和高数据速率，以满足各种复杂的通信需求。无论是在工业自动化、智能家居还是移动设备中，这些芯片都能提供强大的接口连接能力。

Product data sheet Rev. 9 — 22 March 2012 10 of 60

NXP Semiconductors

SC16IS752; SC16IS762

Dual UART with I

C-bus/SPI interface, 64-byte FIFOs, IrDA SIR

7.2.2 Auto-CTS

Figure 6 shows CTS functional timing. The transmitter circuitry checks CTS before

sending the next data character. When CTS

is active, the transmitter sends the next

character. To stop the transmitter from sending the following character, CTS

must be

de-asserted before the middle of the last stop bit that is currently being sent. The

Auto-CTS

function reduces interrupts to the host system. When flow control is enabled,

CTS

level changes do not trigger host interrupts because the device automatically

controls its own transmitter. Without Auto-CTS

, the transmitter sends any data present in

the transmit FIFO and a receiver overrun error may result.

7.3 Software flow control

Software flow control is enabled through the Enhanced Features Register and the Modem

Control Register. Different combinations of software flow control can be enabled by setting

different combinations of EFR[3:0]. Table 3

shows software flow control options.

(1) When CTS is LOW, the transmitter keeps sending serial data out.

(2) When CTS

goes HIGH before the middle of the last stop bit of the current character, the transmitter finishes sending the current

character, but it does not send the next character.

(3) When CTS

goes from HIGH to LOW, the transmitter begins sending data again.

Fig 6. CTS functional timing

start bit 0 to bit 7 stopTX

CTS

002aab041

start stop

bit 0 to bit 7

Table 3. Software flow control options (EFR[3:0])

EFR[3] EFR[2] EFR[1] EFR[0] TX, RX software flow control

0 0 X X no transmit flow control

1 0 X X transmit Xon1, Xoff1

0 1 X X transmit Xon2, Xoff2

1 1 X X transmit Xon1 and Xon2, Xoff1 and Xoff2

X X 0 0 no receive flow control

X X 1 0 receiver compares Xon1, Xoff1

X X 0 1 receiver compares Xon2, Xoff2

1011transmit Xon1, Xoff1

receiver compares Xon1 or Xon2, Xoff1 or Xoff2

0111transmit Xon2, Xoff2

receiver compares Xon1 or Xon2, Xoff1 or Xoff2

1111transmit Xon1 and Xon2, Xoff1 and Xoff2

receiver compares Xon1 and Xon2, Xoff1 and Xoff2

0011no transmit flow control

receiver compares Xon1 and Xon2, Xoff1 and Xoff2

Product data sheet Rev. 9 — 22 March 2012 11 of 60

NXP Semiconductors

SC16IS752; SC16IS762

Dual UART with I

C-bus/SPI interface, 64-byte FIFOs, IrDA SIR

There are two other enhanced features relating to software flow control:

• Xon Any function (MCR[5]): Receiving any character will resume operation after

recognizing the Xoff character. It is possible that an Xon1 character is recognized as

an Xon Any character, which could cause an Xon2 character to be written to the

RX FIFO.

• Special character (EFR[5]): Incoming data is compared to Xoff2. Detection of the

special character sets the Xoff interrupt (IIR[4]) but does not halt transmission. The

Xoff interrupt is cleared by a read of the Interrupt Identification Register (IIR). The

special character is transferred to the RX FIFO.

7.3.1 Receive flow control

When software flow control operation is enabled, the SC16IS752/SC16IS762 will

compare incoming data with Xoff1/Xoff2 programmed characters (in certain cases, Xoff1

and Xoff2 must be received sequentially). When the correct Xoff characters are received,

transmission is halted after completing transmission of the current character. Xoff

detection also sets IIR[4] (if enabled via IER[5]) and causes IRQ

to go LOW.

To resume transmission, an Xon1/Xon2 character must be received (in certain cases

Xon1 and Xon2 must be received sequentially). When the correct Xon characters are

received, IIR[4] is cleared, and the Xoff interrupt disappears.

7.3.2 Transmit flow control

Xoff1/Xoff2 character is transmitted when the RX FIFO has passed the halt trigger level

programmed in TCR[3:0], or the selectable trigger level in FCR[7:6].

Xon1/Xon2 character is transmitted when the RX FIFO reaches the resume trigger level

programmed in TCR[7:4], or falls below the lower selectable trigger level in FCR[7:6].

The transmission of Xoff/Xon(s) follows the exact same protocol as transmission of an

ordinary character from the FIFO. This means that even if the word length is set to be 5, 6,

or 7 bits, then the 5, 6, or 7 least significant bits of Xoff1/Xoff2, Xon1/Xon2 will be

transmitted. (Note that the transmission of 5, 6, or 7 bits of a character is seldom done, but

this functionality is included to maintain compatibility with earlier designs.)

It is assumed that software flow control and hardware flow control will never be enabled

simultaneously. Figure 7

shows an example of software flow control.

剩余59页未读，继续阅读

singdou

粉丝: 0
资源: 1

SC16IS752/SC16IS762：I2C/SPI到RS-232/RS-485转换器芯片

SC16IS750芯片配置

SC16IS752 drivers

sc16is752串口扩展芯片datasheet

sc16is750_int.rar_sc16is750

SC16IS750_Breakout:SC16IS750 Breakout，可从 SparkFun Electronics 获得

SC16IS7xx，SC16IS752参考代码

SC16IS752/SC16IS762：SPI转UART桥接芯片详细规格

SC16IS752/SC16IS762：I2C/SPI到UART转换器芯片详细规格

STM32与MATLAB联合开发：SC16IS752/SC16IS762的I2C/SPI接口指南

STM32与SC16IS752/SC16IS762通信：子地址及I2C/SPI接口解析

最新资源